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Investments in Unconsolidated Entities - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended
Apr. 30, 2010
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Sep. 30, 2013
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]
Dec. 31, 2009
SMM Project, LLC [Member]
Unit
Sqkms
Apr. 30, 2010
Dorado Ocean Resources, Ltd. [Member]
Dec. 31, 2011
Dorado Ocean Resources, Ltd. [Member]
Sep. 30, 2013
Dorado Ocean Resources, Ltd. [Member]
Sep. 30, 2013
Neptune Minerals, Inc. [Member]
Dec. 31, 2011
Neptune Minerals, Inc. [Member]
Jun. 30, 2012
Chatham Rock Phosphate, Ltd. [Member]
Sep. 30, 2013
Chatham Rock Phosphate, Ltd. [Member]
Schedule of Equity Method Investments [Line Items]                            
Book value of investment             $ 500,000              
Ownership percentage             25.00% 41.25%     30.00%      
Mineral exploration area             150,000              
Number of membership units             5              
Common stock, shares issued   81,484,779     75,416,203     450            
Acquisition of additional shares               1,200       2,066,600    
Fair value of investment               2,000,000            
Investment repayment period 3 years                          
Marine service account receivables 2,000,000                          
Shares issued per each share exchanged                       1,000    
Shares received from exchange                       1,650,000    
Shares owned                 1,650          
Net share position in NMI                     6,216,600      
Accounts receivable transferred between related parties       8,227,675                    
Accounts receivable converted to common shares, amount   7,826,086 2,347,826 2,500,000                    
Converted common shares received       2,500,000                    
Value of shares                       $ 1.00    
Receivable reserve                       8,227,675    
Loss from unconsolidated entity                   14,700,000        
Investment at a carrying value                     0      
Convertible notes           500,000                
Convertible notes Interest rate           6.00%                
Convertible notes maturity date           Apr. 26, 2014                
Conversion price per share related to option elected           $ 20.00                
Conversion share price per share           $ 12.00                
Deep sea mining exploratory services                         $ 1,680,000  
Shares received from CRP                         9,320,348  
Equity stake in CRP                           6.90%